Morgan seems right.

If the idiot left after finding out pregnancy might be more difficult then part of the problem was his. Mentally yes, but also physically. A lot of men who have issues - low sperm count, etc - prefer to put all the blame on the women. Add that to everything that is a slayer and his poor little ego was probably completely crushed.

Actually, as long as the uterus was not damaged, having only one ovary should not significantly reduce the ability of a healthy young woman to become pregnant as long as the fallopian tube nearest that ovary is also intact. It might take a little longer, but the ovaries take turns releasing egg cells to be fertilized. If there is damage to the fallopian tube, in vitro fertilization or intrauterine insertion are still options. Any man who would leave his wife over something like this sounds horrible to me, and I fail to see how such a person handled his wife's calling as a slayer before this discovery. Damage to those areas is possible every time they get attacked. I would not be surprised if Faith had trouble carrying a baby to term as a result of the stab wound she got from Buffy, for example.

This is one of the most realistic, sensible crossovers between the two fandoms ive seen in a while. It makes sense that caleb's other victims would have sent red flags up somewhere, to someone, and having that someone be a member of the BAU is both reasonable and expected.

A well written take on Caleb's actions from an outsiders viewpoint.

Good job. I can see them meeting up again in the future. Your 'enhancements' on cannon work and are completely plausible. You could have Caleb start killing first and then find the cult to justify it after the fact. He was already a killer when The First found him.